White Mountains Insurance Group, Ltd. (White Mountains or the Company) is a financial services holding company with primary business interests in property and casualty insurance and reinsurance. The Company's corporate headquarters and its registered office are located in Hamilton, Bermuda and its principal executive office is located in Hanover, New Hampshire.

The Company conducts its principal businesses through:

OneBeacon - specialty insurance. OneBeacon's common shares are listed on the New York Stock Exchange under the symbol "OB". White Mountains owns 75% of OneBeacon.

White Mountains' common shares are listed on the New York Stock Exchange and the Bermuda Stock Exchange under the symbol "WTM". As of December 31, 2014 White Mountains has total assets of approximately $10.5 billion, adjusted shareholders equity of $4 billion, and adjusted book value per Share of $665.